Multiple-frequency ultrasonic imaging by transmitting pulsed waves of two frequencies
作者： Natsuki Yoshizumi , Shigemi Saito , Daisuke Koyama , Kentaro Nakamura , Akihisa Ohya
DOI: 10.1007/S10396-009-0213-7
关键词:
摘要: The aim of this study was realization a broadband measurement system that is capable effectively carrying out frequency compound method. In the present method, secondary wave components difference and sum frequencies are generated along with higher harmonic through nonlinear interaction two-frequency ultrasound. A multiple-frequency beam together initially radiated components. For structure transducer simultaneously radiating two sound waves different frequencies, coaxial arrangement circular-disc piezoelectric ring designed. chosen were 2 8 MHz. addition to 4-MHz second 2-MHz primary sound, sounds 6-MHz 10-MHz can be generated. By measuring acoustic pressure distribution, formation confirmed. signal-to-noise ratio in an agar-gel phantom image increased by 5–6 dB application validity proposed method demonstrated generation human finger image. Further, it found influence Doppler effect small enough almost all attributable propagation sounds. realized sound. effectiveness presented actual imaging.
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